Closest Binary Search Tree Value II LeetCode Solution

Difficulty Level Hard
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Problem Statement:

Closest Binary Search Tree Value II LeetCode Solution: Given the root of a binary search tree, a target value, and an integer k, return the k values in the BST that are closest to the target. You may return the answer in any order.

You are guaranteed to have only one unique set of k values in the BST that are closest to the target.

Examples:

Input:

 root = [4,2,5,1,3], target = 3.714286, k = 2

Output:

 [4,3]

Approach:

Idea:

The problem can be solved by traversing over the tree using any of the traversals. While traversing, we will push the element and its absolute difference with the target value into a maxheap, ensuring that at no time the heap size is greater than k. The idea is to create a heap based on the absolute difference. Once the traversal is done we will simply pop off all the elements from the maxheap into a list.

Basically, we want to make sure that, Whenever we remove from res, it should the element with largest difference with the target among those k elements. It’s somehow achieving the purpose without Priority Queue. Let’s see how:

If we use a priority queue, we are not using the property that this binary tree is a BST too. The solution with a priority queue will work on a binary tree, not just BST. Since we have BST here, we can traverse the elements in an ordered manner, specifically in increasing order if we do in-order traversal. This property allows us to use a normal queue instead of a special priority queue.

Closest Binary Search Tree Value II LeetCode SolutionPin

Code:

Closest Binary Search Tree Value II C++ Solution:

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    vector<int> inorder;
    priority_queue<pair<double,int>> maxheap;

    void inOrder(TreeNode* root,double target, int k){
        if(!root)
            return;
        inOrder(root->left,target,k);
        maxheap.push({abs(root->val-target),root->val});
        if(maxheap.size()>k)
            maxheap.pop();
        inOrder(root->right,target,k);
    }
    
    vector<int> closestKValues(TreeNode* root, double target, int k) {
        inOrder(root,target,k);
        
        vector<int> ans;
        while(!maxheap.empty()){
            ans.push_back(maxheap.top().second);
            maxheap.pop();
        }
        return ans;
    }
};

Complexity Analysis of Closest Binary Search Tree Value II LeetCode Solution:

  • Time complexity: The time complexity of the above code is to push n elements into the heap of the size k.
  • Space complexity: The space complexity of the above code is to keep the heap of k elements and the recursion stack of the tree height h.

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588Count the number of nodes at given level in a tree using BFS175
589Rotate List Leetcode Solution175
590The Knapsack Problem175
591Find the smallest positive integer value that cannot be represented as sum of any subset of a given array175
5923Sum Closest LeetCode Solution175
593Count all subsequences having product less than K175
594Shortest Path in a Grid with Obstacles Elimination LeetCode Solution174
595Minimum number of subsets with distinct elements174
596Minimum insertions to form a palindrome with permutations allowed174
597Find minimum difference between any two elements173
598Insert Interval Leetcode Solution173
599Minimum number of distinct elements after removing m items173
600Maximum Distance in Array173
601Same Tree LeetCode Solution173
602Distance Between Bus Stops Leetcode Solution173
603Rotate Image LeetCode Solution173
604Maximum Number of Chocolates to be Distributed Equally Among k Students173
605Bubble sort using two Stacks173
606How to check if two given sets are disjoint?172
607Sieve of Eratosthenes172
608Find if an Expression has Duplicate Parenthesis or Not172
609Painting Fence Algorithm172
610Longest Increasing Subsequence172
611XOR Operation in an Array Leetcode Solution172
612Stone Game LeetCode172
613Sort Characters By Frequency LeetCode Solution172
614Find Sum of all unique sub-array sum for a given array172
615Reverse a stack without using extra space in O(n)171
616Applications of Breadth First Search and Depth First Search171
617Word Pattern171
618Permutation in String Leetcode Solution171
619Defanging an IP Address Leetcode Solution171
620License Key Formatting Leetcode Solution171
621Frog Jump Leetcode Solution171
622Replace Elements with Greatest Element on Right Side Leetcode Solution171
623K Empty Slots LeetCode170
624Minimum Cost to Hire K Workers170
625Sort Array By Parity LeetCode Solution170
626Smallest Good Base170
627Word Wrap Problem170
628House Robber170
629Find the Duplicate Number LeetCode Solution170
630Remove All Occurrences of a Substring LeetCode Solution170
631Isomorphic Strings169
632Distance of nearest cell having 1 in a binary matrix169
633Non-overlapping sum of two sets169
634Printing brackets in Matrix Chain Multiplication Problem169
635Best Time to Buy and Sell Stock LeetCode Solution169
636Maximum Consecutive Numbers Present in an Array169
637Longest Substring with At Least K Repeating Characters LeetCode Solution169
638Tracking current Maximum Element in a Stack169
639Segregate 0s and 1s in an Array169
640Minimum Depth of Binary Tree Leetcode Solution169
641Optimal Account Balancing LeetCode Solution169
642Wiggle Sort168
643Longest Substring with At Most K Distinct Characters LeetCode Solution168
644Valid Palindrome II Leetcode Solution168
645Binary Tree Zigzag Level Order Traversal LeetCode Solution168
646Kth Missing Positive Number Leetcode Solution168
647Merge Two Balanced Binary Search Trees168
648Moving Average from Data Stream Leetcode Solution168
649Employee Free Time LeetCode Solution168
650Iterative Method to find Height of Binary Tree168
651Coin Change Problem168
652Queries for counts of array elements with values in given range167
653How to Create Mergable Stack?167
654Path With Maximum Minimum Value LeetCode Solution167
655Maximum difference between first and last indexes of an element in array167
656Check If It Is a Straight Line Leetcode Solution167
657Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions167
658Sum of All Odd Length Subarrays Leetcode Solution167
659Count Good Nodes in Binary Tree Leetcode Solution167
660Find Maximum Level sum in Binary Tree167
661Reorganize String167
662Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest166
663Find the Distance Value Between Two Arrays Leetcode Solution166
664Maximum Number of Occurrences of a Substring Leetcode Solution166
665Best Time to Buy and Sell Stock with Cooldown Leetcode Solution166
666Flipping an Image LeetCode Solution166
667Strobogrammatic Number LeetCode Solution166
668Find Largest d in Array such that a + b + c = d166
669GCD Of Two Numbers166
670Convert an array to reduced form165
671Remove Invalid Parentheses Leetcode Solution165
672Find pairs with given sum such that elements of pair are in different rows165
673Print the Fibonacci numbers in reverse order165
674Check if a queue can be sorted into another queue using a stack165
675Valid Palindrome165
676K Empty Slots165
677Letter Combinations of a Phone Number165
678Reducing Dishes LeetCode Solution165
679Delete consecutive same words in a sequence165
680Inorder Successor of a node in Binary Tree165
681Partition Labels LeetCode Solution165
682Increasing Decreasing String Leetcode Solution164
683Check If Two String Arrays are Equivalent Leetcode Solution164
684Factorial Trailing Zeroes Leetcode Solution164
685To Lower Case Leetcode Solution164
686Number of Dice Rolls With Target Sum LeetCode Solution164
687Maximum Number of Coins You Can Get Leetcode Solution164
688BFS vs DFS for Binary Tree164
689Form minimum number from given sequence163
690Edit Distance LeetCode Solution163
691Subset Sum Leetcode163
692Longest Increasing Path in a Matrix LeetCode Solution163
693Delete Nth node from the end of the given linked list163
694Permutation Sequence LeetCode Solution163
695Populating Next Right Pointers in Each Node163
696Find Leaves of Binary Tree LeetCode Solution163
697Find the Smallest Divisor given a Threshold Leetcode Solution163
698Power of Four Leetcode Solution163
699Valid Perfect Square Leetcode Solution163
700Lucky Numbers in a Matrix Leetcode Solution163
701Recover Binary Search Tree163
702Partition Array Into Three Parts With Equal Sum Leetcode Solution163
703Unique Paths II Leetcode Solution162
704Merge Two Binary Trees LeetCode Solution162
705Construct BST from given Preorder Traversal162
706Sort Array by Increasing Frequency Leetcode Solution162
707Reverse Only Letters LeetCode Solution162
708Binary Tree zigzag level order Traversal162
709Find whether an array is subset of another array162
710Dynamic Programming Basics162
711Reversing a Queue using Recursion162
712Maximum Product of Two Elements in an Array Leetcode Solution162
713String to Integer (atoi) LeetCode Solution162
714Ugly Number Leetcode Solution162
715Add and Search Word – Data structure design LeetCode161
716Decompress Run-Length Encoded List Leetcode Solution161
717Keyboard Row Leetcode Solution161
718Convert a Number to Hexadecimal Leetcode Solution161
719Reservoir Sampling161
720Find the largest multiple of 3161
721Robot Room Cleaner Leetcode Solution161
722Binomial Coefficient161
723Restore IP Addresses Leetcode Solution160
724Finding K closest element160
725Perform String Shifts Leetcode160
726Majority Element II Leetcode Solution160
727Find the node with minimum value in a Binary Search Tree160
728Bulb Switcher LeetCode Solution160
729Check if Two Expressions With Brackets are Same159
730Numbers with prime frequencies greater than or equal to k159
731Find Maximum Depth of Nested Parenthesis in a String159
732Minimum Cost For Tickets Leetcode Solution159
733Race Car LeetCode Solution159
734Word Pattern LeetCode Solution159
735Hamming Distance Leetcode Solution159
736Sum of f(a[i], a[j]) over all pairs in an array of n integers159
737Rank Transform of an Array Leetcode Solution159
738Find Pair with Greatest Product in Array159
739Snakes and Ladders LeetCode Solution159
740First Unique Character in a String LeetCode Solution158
741Minimum Distance Between BST Nodes Leetcode Solution158
742Binary Tree Maximum Path Sum LeetCode Solution158
743Morris Traversal158
744Number of Islands II LeetCode Solution158
745Invert Binary Tree LeetCode Solution158
746Student Attendance Record I Leetcode Solution158
747Maximum 69 Number Leetcode Solution158
748Tiling Problem158
749Linked List Cycle158
750Minimum Height Trees158
751Generate all possible sorted arrays from alternate elements of two given sorted arrays158
752Merge K Sorted Linked Lists158
753Maximum Product of Three Numbers LeetCode Solution158
754Queue based approach for first non-repeating character in a stream158
755Non-decreasing Array LeetCode Solution158
756Minimum time required to rot all oranges158
757Diagonal Traversal of Binary Tree158
758Longest Span with same Sum in two Binary arrays158
759Find unique character in a string158
760Sorted Linked List to Balanced BST157
761Remove Nth Node From End of List Leetcode Solution157
762String Compression LeetCode Solution157
763Kth ancestor of a node in binary tree157
764Stack Permutations (Check if an array is stack permutation of other)157
765Maximum Depth of N-ary Tree Leetcode Solution157
766Best Meeting Point LeetCode Solution157
767Largest subarray with equal number of 0s and 1s157
768Remove brackets from an algebraic string containing + and – operators157
769Minimize Maximum Pair Sum in Array LeetCode Solution157
770Find if Path Exists in Graph Leetcode Solution157
771Special Array With X Elements Greater Than or Equal X Leetcode Solution156
772Check If Array Pairs Are Divisible by k LeetCode Solution156
773Total Numbers With no Repeated Digits in a Range156
774Find All Duplicates in an Array LeetCode Solution156
775Maximum Length of a Concatenated String with Unique Characters Leetcode Solution156
776Elements to be added so that all elements of a range are present in array156
777Largest Rectangle in Histogram LeetCode Solution156
778Final Prices With a Special Discount in a Shop Leetcode Solution156
779Symmetric Tree Leetcode Solution156
780Partition to K Equal Sum Subsets Leetcode Solution156
781Jump Game156
782Transpose Graph155
783k-th missing element in increasing sequence which is not present in a given sequence155
784Search a 2D Matrix II Leetcode Solution155
785Largest rectangular sub-matrix whose sum is 0155
786Program for Bridge and Torch problem155
787Split a String in Balanced Strings Leetcode Solution155
788Evaluate Reverse Polish Notation LeetCode Solution155
789Find Median from Data Stream LeetCode Solution155
790Count items common to both the lists but with different prices155
791Maximum Difference Between Increasing Elements LeetCode Solution155
792N-Queens LeetCode Solution154
793Sort an array according to the order defined by another array154
794Number of NGEs to the Right154
795Check for Palindrome after every character replacement Query154
796Base 7 Leetcode Solution154
797Search in a Binary Search Tree Leetcode Solution154
798Longest Subarray Having Count of 1s One More than Count of 0s154
799Print a Binary Tree in Vertical Order154
800Valid Number154
801Interval Tree154
802Course Schedule II – LeetCode154
803Growable array based stack154
804Deletion in a Binary Tree154
805Circular Queue154
806Minimum Jumps to Reach Home LeetCode Solution154
807Minimum Time Visiting All Points Leetcode Solution153
808Nearest Exit from Entrance in Maze LeetCode Solution153
809Sort Array By Parity II Leetcode Solution153
810Minimum swaps to make sequences increasing153
811Number Complement Leetcode Solution153
812Spiral Matrix II Leetcode Solution153
813One Edit Distance LeetCode Solution153
814Reorder Data in Log Files LeetCode Solution153
815Merge Sorted Array LeetCode Solution153
816Last Stone Weight II LeetCode Solution153
817Remove Duplicates from Sorted List II153
818Minimum number of jumps to reach end153
819Nested List Weight Sum II LeetCode Solution153
820Count quadruples from four sorted arrays whose sum is equal to a given value x153
821String comparison containing wildcards153
822Get Maximum in Generated Array Leetcode Solution153
823Maximum Profit in Job Scheduling Leetcode Solution152
824A Space Optimized DP solution for 0-1 Knapsack Problem152
825Find all triplets with zero sum152
826Iterative Preorder Traversal152
827Maximum size subarray sum equals k152
828Convert BST to Min Heap152
829Crawler Log Folder Leetcode Solution152
830Regular Expression Matching152
831Subarray Product Less Than K LeetCode Solution152
832Find Maximum Sum Possible Equal Sum of Three Stacks152
833Relative Ranks Leetcode Solution152
834Remove Duplicates from Sorted List LeetCode Solution152
835Priority Queue using doubly linked list152
836Form Minimum Number From Given Sequence151
837Insert into a Binary Search Tree Leetcode Solution151
838Design a Stack With Increment Operation Leetcode Solution150
839Brick Wall LeetCode Solution150
840Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution150
841Level order Traversal in Spiral Form150
842Path with maximum average value150
843Sum of nearest smaller and greater number150
844Tree Traversal (Preorder, Inorder & Postorder)150
845Minimum Swaps to Make Strings Equal Leetcode Solution150
846Maximum Nesting Depth of the Parentheses Leetcode Solution150
847Sort Colors150
848Alien Dictionary LeetCode Solution150
849Valid Parentheses Leetcode Solution150
850Minimum Number of Taps to Open to Water a Garden LeetCode Solution150
851LCS (Longest Common Subsequence) of three strings150
852Sequences of given length where every element is more than or equal to twice of previous150
853Given an Array of Pairs Find all Symmetric Pairs in it150
854Check if a given array can represent Preorder Traversal of Binary Search Tree150
855Binary Search Tree Search and Insertion150
856Friends Pairing Problem150
857Find the subarray with least average150
858Top K Frequent Words LeetCode Solution150
859Can Place Flowers LeetCode Solution150
860Subset with sum divisible by m150
861Partition List Leetcode Solution150
862Brightest Position on Street LeetCode Solution149
863Range LCM Queries149
864Missing Element in Sorted Array LeetCode Solution149
865Find the Only Repetitive Element Between 1 to N-1149
866Check whether a given Binary Tree is Complete or not149
867Balanced Expression with Replacement149
868Subsequence of Size K With the Largest Even Sum LeetCode Solution149
869Identify and Mark Unmatched Parenthesis in an Expression149
870Minimum Sum Path in a Triangle149
871Permutation Coefficient149
872Find All Possible Recipes from Given Supplies LeetCode Solution149
873Count Distinct Elements in Every Window of Size K149
874Count Negative Numbers in a Sorted Matrix LeetCode Solution149
875Sorted Array to Balanced BST149
876Guess Number Higher or Lower LeetCode Solution149
877Clone Graph LeetCode Solution149
878Matrix Chain Multiplication149
879Number of Days Between Two Dates LeetCode Solution149
880Union and Intersection of two Linked Lists148
881Repeated Substring Pattern LeetCode Solution148
882Time Based Key-Value Store LeetCode Solution148
883Find Common Characters Leetcode Solution148
884Check if stack elements are pairwise consecutive148
885Destination City Leetcode Solution148
886An Interesting Method to generate Binary Numbers from 1 to n148
887Diagonal Traverse LeetCode Solution148
888Range sum queries without updates148
889Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution148
890GCDs of given index ranges in an array148
891Count ways to reach the nth stair using step 1, 2 or 3148
892Guess Number Higher or Lower II147
893Check if an Array is Stack Sortable147
894Shortest Word Distance Leetcode Solution147
895Spiral Matrix III LeetCode Solution147
896Rearrange an Array Such that arr[i] is equal to i147
897Three way partitioning of an array around a given range147
898Convert Sorted List to Binary Search Tree147
899Distinct adjacent elements in an array147
900K’th Largest Element in BST when modification to BST is not allowed147
901Design Browser History LeetCode Solution147
902Water Bottles Leetcode Solution147
903Find distance between two nodes of a Binary Tree147
904Averages of Levels in Binary Tree147
905Insert Delete GetRandom147
906Diagonal Traversal LeetCode Solution147
907Delete And Earn147
908Lemonade Change Leetcode Solution147
909BFS for Disconnected Graph147
910Construct Complete Binary Tree from its Linked List Representation146
911Robot Bounded In Circle LeetCode Solution146
912Maximum Score After Splitting a String Leetcode Solution146
913Queue using Stacks146
914Vertical sum in a given binary tree146
915Minimum sum of multiplications of n numbers146
916Set Matrix Zeroes Leetcode Solution146
917Daily Temperatures Leetcode Solution146
918Rearrange Spaces Between Words Leetcode Solution146
919Special Positions in a Binary Matrix Leetcode Solution146
920Least Number of Unique Integers after K Removals Leetcode Solution146
921Number of Distinct Islands Leetcode Solution145
922Dividing Array into Pairs With Sum Divisible by K145
923Construct the Rectangle Leetcode Solution145
924Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i145
925Alien Dictionary145
926Find all permuted rows of a given row in a matrix145
927Iterative Postorder Traversal Using Two Stacks145
928Check if the given array can represent Level Order Traversal of Binary Search Tree145
929Merge Two Sorted Lists Leetcode144
930Binary Tree Longest Consecutive Sequence LeetCode Solution144
931A program to check if a binary tree is BST or not144
9324Sum144
933Print Fibonacci sequence using 2 variables144
934Construct BST from its given Level Order Traversal144
935Split Array Into Consecutive Subsequences144
9363 Sum144
937Palindrome Partitioning Leetcode Solution144
938Maximum Subarray Sum Excluding Certain Elements144
939Count Subarrays with Same Even and Odd Elements144
940Lexicographical Numbers Leetcode Solution144
941Largest area rectangular sub-matrix with equal number of 1’s and 0’s144
942Three Consecutive Odds Leetcode Solution143
943Sliding Window Maximum143
944Median of Two Sorted Arrays143
945Check if any two intervals overlap among a given set of intervals143
946Remove Duplicates from Sorted List II LeetCode Solution143
947Queries for GCD of all numbers of an array except elements in a given range143
948Maximum Frequency Stack Leetcode Solution143
949Create Maximum Number143
950Minimum Height Trees LeetCode Solution143
951Strongly Connected Component143
952Difference Array | Range update query in O(1)143
953Longest Palindromic Subsequence143
954Number of Equivalent Domino Pairs Leetcode Solution143
955Stone Game II Leetcode143
956Can Make Arithmetic Progression From Sequence Leetcode Solution142
957Infix to Postfix142
958Analyze User Website Visit Pattern LeetCode Solution142
959My Calendar I LeetCode Solution142
960All Unique Triplets that Sum up to a Given Value142
961Maximize Sum of Array after K Negations Leetcode Solution142
962Trim a Binary Search Tree142
963Collect maximum points in a grid using two traversals142
964Find the Difference Leetcode Solution141
965Merging Intervals141
966Unique Paths II141
967Binary array after M range toggle operations141
968Kth Smallest Element in a BST Leetcode Solution141
969Count Submatrices With All Ones LeetCode Solution141
970Find postorder traversal of BST from preorder traversal141
971Count Primes in Ranges141
972Shuffle 2n integers as a1-b1-a2-b2-a3-b3-..bn without using extra space141
973Minesweeper LeetCode Solution141
974Maximum Product Subarray141
975Intersection of Two Linked Lists LeetCode Solution141
976Pattern Occurrences using Stack140
977Reverse Nodes in K-Group140
978Longest Nice Substring LeetCode Solution140
979Word Break140
980The Painter’s Partition Problem140
981Symmetric Tree140
982Sign of the Product of an Array LeetCode Solution140
983Find Maximum of Minimum for Every Window Size in a Given Array140
984Boundary Traversal of binary tree140
985Height of a generic tree from parent array140
986Count subarrays where second highest lie before highest140
987Length of Longest Fibonacci Subsequence140
988Climbing stairs140
989Count pair with Given Sum140
990K Closest Points to Origin Leetcode Solution140
991Friends Of Appropriate Ages LeetCode Solution139
992Largest divisible pairs subset139
993Largest Substring Between Two Equal Characters Leetcode Solution139
994Asteroid Collision LeetCode Solution139
995Binary Search Tree Delete Operation139
996Maximum length subsequence with difference between adjacent elements as either 0 or 1139
997Product of Array Except Self LeetCode Solution139
998Level Order Traversal of Binary Tree139
999Palindrome Partitioning139
1000Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution139
1001Newman-Conway Sequence139
1002Valid Boomerang Leetcode Solution139
1003Largest Number Leetcode Solution139
1004Insertion in a Binary Tree138
1005Maximum Length of Repeated Subarray138
1006Double the first element and move zero to end138
1007The Maze III LeetCode Solution138
1008Segment Tree138
1009Merge Sort138
1010Maximum subsequence sum such that no three are consecutive138
1011Graph Valid Tree LeetCode Solution138
1012Scramble String LeetCode Solution138
1013Minimum Index Sum of Two Lists138
1014Breadth First Search (BFS) for a Graph138
1015Find Duplicate Subtrees138
1016Construction of Longest Increasing Subsequence (N log N)138
1017Number Of Longest Increasing Subsequence138
1018Maximum Number of Ways to Partition an Array LeetCode Solution138
1019Boolean Parenthesization Problem138
1020Find number of pairs in an array such that their XOR is 0138
1021Shortest Completing Word Leetcode Solution138
1022Ugly Numbers137
1023Compute nCr % p137
1024Number of palindromic paths in a matrix137
1025Depth First Search (DFS) for a Graph137
1026Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’137
1027Find the First Circular Tour that visits all the Petrol Pumps137
1028String Matching in an Array Leetcode Solution137
1029Maximum Product of Indexes of Next Greater on Left and Right137
1030Maximum Sum of 3 Non-Overlapping Subarrays137
1031Construct Binary Tree from given Parent Array representation137
1032Rearrange array such that even positioned are greater than odd137
1033Binary Search Tree137
1034Decrypt String from Alphabet to Integer Mapping Leetcode Solution137
1035Longest subsequence such that difference between adjacents is one137
1036Kill Process LeetCode Solution137
1037Maximum weight transformation of a given string136
1038Iterative Depth First Traversal of Graph136
1039Count minimum steps to get the given desired array136
1040K maximum sums of overlapping contiguous sub-arrays136
1041Morris Inorder Traversal136
1042Level order traversal using two Queues136
1043Design Hit Counter LeetCode Solution136
1044Make The String Great Leetcode Solution136
1045First missing positive136
1046Partition Equal Subset Sum136
1047Build an Array With Stack Operations Leetcode Solution136
1048Next Greater Element III LeetCode Solution136
1049Serialize and Deserialize Binary Tree136
1050Add two numbers135
1051Available Captures for Rook Leetcode Solution135
1052Invalid Transactions LeetCode Solution135
1053Custom Sort String Leetcode Solution135
1054Advantages of BST over Hash Table135
1055Maximum difference between frequency of two elements such that element having greater frequency is also greater135
1056Bitwise AND of Numbers Range LeetCode Solution135
1057Balanced Binary Tree135
1058Kth Smallest Element in a Sorted Matrix LeetCode Solution135
1059Employee Importance LeetCode Solution134
1060Validate Binary Search Tree134
1061Path Sum II LeetCode Solution134
1062Count pairs from two sorted arrays whose sum is equal to a given value x134
1063Find a Peak Element II LeetCode Solution133
1064Recover Binary Search Tree Leetcode Solution133
1065Rearrange array such that even index elements are smaller and odd index elements are greater133
1066Move all negative elements to end in order with extra space allowed133
1067Lowest Common Ancestor133
1068Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution133
1069Defanging an IP Address LeetCode Solution133
1070Generate Parentheses Leetcode Solution133
1071Implement Trie (Prefix Tree) Leetcode Solution133
1072Minimum Size Subarray Sum133
1073Ugly Number II LeetCode Solution133
1074Super Ugly Number133
1075Subarrays with K Different Integers Leetcode Solution132
1076Regular Expression Matching Regular Expression Matching LeetCode Solution132
1077Number of Closed Islands Leetcode Solution132
1078Populating Next Right Pointers in Each Node Leetcode Solution132
1079Binary Tree Right Side View LeetCode Solution132
1080Remove Duplicates from Sorted Array II Leetcode Solution132
1081Root to Leaf path with target sum Leetcode Solutions132
1082Search in Sorted Rotated Array132
1083Largest BST Subtree LeetCode Solution132
1084Find Peak Element132
1085Find whether a subarray is in form of a mountain or not132
1086Find Smallest Range Containing Elements from k Lists131
1087Types of Binary Tree131
1088Number of Students Doing Homework at a Given Time Leetcode Solution131
1089Count Largest Group Leetcode Solution131
1090Smallest Common Region Leetcode Solution131
1091Day of the Year Leetcode Solution131
1092Remove Palindromic Subsequences Leetcode Solution131
1093Combination Sum IV LeetCode Solution131
1094Longest Bitonic Subsequence131
1095Minimum Absolute Difference in BST Leetcode Solution130
1096Kth Smallest Product of Two Sorted Arrays LeetCode Solution130
1097Maximize Distance to Closest Person LeetCode Solution130
1098Binary Tree Data Structure130
1099Consecutive Characters LeetCode Solution130
1100Print all triplets in sorted array that form AP130
1101Number of siblings of a given Node in n-ary Tree130
1102Serialize and Deserialize Binary Tree LeetCode Solution130
1103Clone a Binary Tree with Random Pointers130
1104Remove duplicates from sorted array129
1105Convert BST into a Min-Heap without using array129
1106Sum of Even Numbers After Queries129
1107Increasing Triplet Subsequence LeetCode Solution129
1108Find maximum difference between nearest left and right smaller elements129
1109Print Next Greater Number of Q queries129
1110Construct K Palindrome Strings LeetCode Solution129
1111Level of Each node in a Tree from source node129
1112Path Sum129
1113Find the minimum distance between two numbers129
1114Palindrome Permutation LeetCode Solution129
1115Distinct Subsequences129
1116Next Permutation Leetcode Solution129
1117Cutting a Rod129
1118Valid Tic-Tac-Toe State LeetCode Solution128
1119Third Maximum Number Leetcode Solution128
1120Minimum sum of squares of character counts in a given string after removing k characters128
1121Divisible Pairs Counting128
1122Mean of Array After Removing Some Elements Leetcode Solution128
1123Maximum Product Subarray128
1124Find Three Element From Different Three Arrays Such That a + b + c = sum128
1125Iterative method to find ancestors of a given binary tree128
1126Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution128
1127Bottom View of a Binary Tree128
1128Reformat The String Leetcode Solution128
1129Constant time range add operation on an array128
1130Delete Nodes and Return Forest Leetcode Solution127
1131Print Right View of a Binary Tree127
1132Prime Palindrome LeetCode Solution127
1133Maximum Product of Splitted Binary Tree LeetCode Solution127
1134Minimum Score Triangulation of Polygon Leetcode Solution127
1135Thousand Separator Leetcode Solution127
1136Write Code to Determine if Two Trees are Identical127
1137Longest Subarray of 1’s After Deleting One Element LeetCode Solution127
1138Longest Increasing Consecutive Subsequence127
1139Products of ranges in an array127
1140Search an Element in Sorted Rotated Array126
1141Queries for Number of Distinct Elements in a Subarray126
1142Swap Nodes In Pairs126
1143Cells with Odd Values in a Matrix LeetCode Solution126
1144Moser-de Bruijn Sequence126
1145Find maximum length Snake sequence126
1146Search Insert Position126
1147Palindromic Substrings Leetcode Solution126
1148Red-Black Tree Introduction125
1149Merge two BSTs with limited extra space125
1150Maximum Binary Tree125
1151Subset Sum Problem in O(sum) space125
1152Topological Sorting125
1153Maximize sum of consecutive differences in a circular array124
1154Closest Binary Search Tree Value Leetcode Solution124
1155Kth Smallest Number in Multiplication Table Leetcode Solution124
1156Bus Routes Leetcode Solution124
1157Priority Queue124
1158Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution124
1159Transform a BST to Greater sum Tree124
1160Diameter of N-Ary Tree LeetCode Solution124
1161Print modified array after executing the commands of addition and subtraction124
1162Check Array Formation Through Concatenation Leetcode Solution124
1163Search Suggestions System LeetCode Solution123
1164Golomb sequence123
1165Find Largest Value in Each Tree Row LeetCode Solution123
1166Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution123
1167Decision Tree123
1168Web Crawler LeetCode Solution123
1169Minimum Sideway Jumps LeetCode Solution123
1170Possible Bipartition LeetCode Solution123
1171Minimum Cost to Move Chips to The Same Position LeetCode Solution122
1172K’th Largest element in BST using constant extra space122
1173Rotate Array122
1174Find the smallest binary digit multiple of given number122
1175Binary Tree to Binary Search Tree Conversion122
1176Longest Repeated Subsequence122
1177Minimum Moves to Equal Array Elements LeetCode Solution122
1178Compare Strings by Frequency of the Smallest Character Leetcode Solution122
1179Find a sorted subsequence of size 3 in linear time122
1180Count even length binary sequences with same sum of first and second half bits122
1181Decrease Elements To Make Array Zigzag LeetCode Solution121
1182Given a binary tree, how do you remove all the half nodes?121
1183Matchsticks to Square Leetcode Solution121
1184Swapping Nodes in a Linked List Leetcode Solution121
1185Graph and its representation121
1186First Bad Version121
1187Reverse a Path in BST using Queue121
1188Factorial Trailing Zeroes LeetCode Solution121
1189Reformat Date LeetCode Solution120
1190Maximum sum of pairs with specific difference120
1191Queue Reconstruction by Height120
1192Contiguous Array LeetCode Solution120
1193Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution120
1194Count Pairs Whose Products Exist in Array120
1195Number of Orders in the Backlog Leetcode Solution120
1196Maximum number of segments of lengths a, b and c120
1197Lowest Common Ancestor in Binary Search Tree120
1198Convert Sorted Array to Binary Search Tree LeetCode Solutions120
1199Maximum Depth Of Binary Tree119
1200Path Crossing Leetcode Solution119
1201Sum of Left Leaves LeetCode Solution119
1202Valid Triangle Number119
1203How to print maximum number of A’s using given four keys119
1204Closest Leaf in a Binary Tree LeetCode Solution119
1205Concatenation of Array LeetCode Solution119
1206Maximum sum bitonic subarray119
1207Range Queries for Longest Correct Bracket Subsequence119
1208Minimum Swaps To Make Sequences Increasing LeetCode Solution118
1209BST to a Tree with Sum of all Smaller Keys118
1210Champagne Tower LeetCode Solution118
1211Lowest Common Ancestor of a Binary Tree Leetcode Solution118
1212Moving Stones Until Consecutive Leetcode Solution118
1213Write a function to get the intersection point of two Linked Lists117
1214Perfect Squares LeetCode Solution117
1215Integer Break LeetCode Solution117
1216LRU Cache Leetcode Solution117
1217Guess The Word117
1218Divide Two Integers Leetcode Solution117
1219Array Queries for multiply replacements and product117
1220Kth Smallest Element in a BST117
1221Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution116
1222Mean of range in array116
1223Check if all levels of two Binary Tree are anagrams or not116
1224Sliding Window Median Leetcode Solution116
1225Maximum Value at a Given Index in a Bounded Array LeetCode Solution116
1226Valid Perfect Square LeetCode Solution116
1227Replace two consecutive equal values with one greater116
1228Queries on Probability of Even or Odd Number in given Ranges116
1229Maximize Elements Using Another Array116
1230Flatten 2D Vector LeetCode Solution116
1231Maximum sum of a path in a Right Number Triangle116
1232New 21 Game115
1233Arithmetic Slices II – Subsequence LeetCode Solution115
1234Power of Two115
1235Range Sum Query using Sparse Table115
1236Design Skiplist LeetCode Solution115
1237Maximum Array from Two given Arrays Keeping Order Same115
1238Check if each internal node of a BST has exactly one child114
1239Bold Words in String LeetCode Solution114
1240The kth Factor of n Leetcode Solution114
1241Find Minimum in Rotated Sorted Array II LeetCode Solution114
1242Check Completeness of a Binary Tree LeetCode Solution114
1243Check for Identical BSTs without building the trees114
1244Graph Cloning114
1245Longest Common Prefix Using Word by Word Matching114
1246Count Subsets Having Distinct Even Numbers113
1247Maximum Product Subarray113
1248Largest Plus Sign Leetcode Solution113
1249Print modified array after multiple array range increment operations113
1250Contiguous Array113
1251Parallel Courses II LeetCode Solution113
1252Find k-th smallest element in BST (Order Statistics in BST)113
1253Print n terms of Newman-Conway Sequence112
1254Find minimum number of merge operations to make an array palindrome112
1255Symmetric Tree LeetCode Solution Leetcode Solution112
1256Print Ancestors of a Given Binary Tree Node Without Recursion112
1257Minimum Remove to Make Valid Parentheses LeetCode Solution111
1258Merge k Sorted Lists Leetcode Solution111
1259Missing Number111
1260Image Overlap LeetCode Solution111
1261Check if two nodes are on the same path in a Tree111
1262Count and Toggle Queries on a Binary Array110
1263Verify Preorder Serialization of a Binary Tree110
1264Excel Sheet Column Title LeetCode Solution110
1265Smallest Range II Leetcode Solution110
1266Number of elements less than or equal to a given number in a given subarray110
1267Next greater element109
1268Palindrome Partitioning108
1269Minimum Time to Collect All Apples in a Tree LeetCode Solution108
1270Orderly Queue LeetCode Solution108
1271Check If a String Can Break Another String Leetcode Solution108
1272Min Cost Climbing Stairs LeetCode Solution107
1273Koko Eating Bananas LeetCode Solution107
1274Different Ways to Add Parentheses Leetcode Solution107
1275Check in binary array the number represented by a subarray is odd or even106
1276Largest Submatrix With Rearrangements LeetCode Solution106
1277Longest Substring Without Repeating Characters Leetcode Solution106
1278Peeking Iterator LeetCode Solution106
1279Newman–Shanks–Williams prime105
1280Check if X can give change to every person in the Queue105
1281Merge Sorted Array104
1282Queries for Decimal Values of Subarrays of a Binary Array104
1283Range Minimum Query (Square Root Decomposition and Sparse Table)103
1284Array Nesting Leetcode Solution102
1285Encoded String With Shortest Length LeetCode Solution102
1286Arranging Coins Leetcode Solution101
1287Maximum Sum Increasing Subsequence101
1288Find maximum average subarray of k length101
1289Check given array of size n can represent BST of n levels or not100
1290Number of indexes with equal elements in given range100
1291Maximum product of an increasing subsequence100
1292Convert a BST to a Binary Tree such that sum of all greater keys is added to every key100
1293Convert to Base -2 LeetCode Solution99
1294Minimum Total Space Wasted With K Resizing Operations LeetCode Solution99
1295Continuous Subarray Sum LeetCode Solution98
1296Find the Winner of the Circular Game LeetCode Solution98
1297Minimum Number of People to Teach LeetCode Solution98
1298Random Pick Index LeetCode Solution98
1299Add Two Numbers II Leetcode Solution97
1300Jump Game IV LeetCode Solution97
1301Reach a Number LeetCode Solution97
1302Binary Tree to Binary Search Tree Conversion using STL set97
1303Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution96
1304Vertical Order Traversal of Binary Tree LeetCode Solution96
1305Queries on XOR of greatest odd divisor of the range96
1306Palindrome Number LeetCode Solution95
1307Insert Delete GetRandom O(1) Leetcode Solution94
1308Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution94
1309Design Underground System Leetcode Solution90
1310Print Maximum Length Chain of Pairs89
1311Detect Capital Leetcode Solution88
1312Shifting Letters LeetCode Solution88
1313Design A Leaderboard Leetcode Solution87
1314Substring with Concatenation of All Words Leetcode Solution84
1315Minimum Swaps to Group All 1’s Together Leetcode Solution83
1316Count Sub Islands LeetCode Solution83
1317Top K Frequent Elements LeetCode Solution83
1318Binary Tree Inorder Traversal LeetCode Solution81
1319Minimum Path Sum Leetcode Solution81
1320Longest Common Subsequence LeetCode Solution78
1321Maximum Population Year LeetCode Solution77
1322Odd Even Linked List Leetcode Solution77
1323Find the Town Judge LeetCode Solution77
1324Best Meeting Point LeetCode Solution76
1325Decode String Leetcode Solution76
1326Find the Town Judge LeetCode Solution76
1327Shortest Unsorted Continuous Subarray LeetCode Solution75
1328Sum Root to Leaf Numbers LeetCode Solution74
1329Design Add and Search Words Data Structure LeetCode Solution71
1330Rectangle Overlap LeetCode Solution71
1331Maximum Population Year LeetCode Solution71
1332Flatten Binary Tree to Linked List LeetCode Solution69
1333Score of Parenthesis LeetCode Solution68
1334Stone Game IV LeetCode Solution67
1335Insert into a Sorted Circular Linked List LeetCode Solution67
1336Range Sum Query 2D – Immutable LeetCode Solution66
1337Reveal Cards In Increasing Order Leetcode Solution65
1338Valid Triangle Number LeetCode Solution64
1339Is Graph Bipartite? LeetCode Solution63
1340Divide Chocolate LeetCode Solution57
1341Step-By-Step Directions From a Binary Tree Node to Another LeetCode Solution52
1342Reverse Integer Leetcode Solution47
1343Range Sum of BST LeetCode Solution46
1344Sort Colors LeetCode Solution43
1345Find K Closest Elements LeetCode Solution43
1346Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution40
1347Rotate String LeetCode Solution40
1348Excel Sheet Column Number LeetCode Solution39
1349H-Index Leetcode Solution20
1350Maximum Size Subarray Sum Equals k Leetcode Solution20
1351High Five LeetCode Solution19
1352Camelcase Matching Leetcode Solution18
1353Monotonic Array Leetcode Solution15
1354Group Shifted Strings Leetcode Solution13
1355Insert Delete GetRandom O(1) – Duplicates allowed LeetCode Solution12
1356Unique Binary Search Trees LeetCode Solution11
1357Peak Index in a Mountain Array LeetCode Solution11
1358Valid Triangle Number LeetCode Solution10
1359Next Greater Element I Leetcode Solution9
1360Isomorphic Strings LeetCode Solution9
1361Minimum Number of Arrows to Burst Balloons LeetCode Solution8
1362Flatten Binary Tree to Linked List LeetCode Solution8
1363Swim in Rising Water LeetCode Solution7
1364Sentence Screen Fitting LeetCode Solution5
1365Closest Binary Search Tree Value II LeetCode Solution1
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